1 //===-- HistoryUnwind.cpp ---------------------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/lldb-private.h"
11 
12 #include "Plugins/Process/Utility/HistoryUnwind.h"
13 #include "Plugins/Process/Utility/RegisterContextHistory.h"
14 
15 #include "lldb/Target/Process.h"
16 #include "lldb/Target/StackFrame.h"
17 #include "lldb/Target/Target.h"
18 #include "lldb/Target/Thread.h"
19 
20 using namespace lldb;
21 using namespace lldb_private;
22 
23 // Constructor
24 
25 HistoryUnwind::HistoryUnwind(Thread &thread, std::vector<lldb::addr_t> pcs,
26                              bool stop_id_is_valid)
27     : Unwind(thread), m_pcs(pcs), m_stop_id_is_valid(stop_id_is_valid) {}
28 
29 // Destructor
30 
31 HistoryUnwind::~HistoryUnwind() {}
32 
33 void HistoryUnwind::DoClear() {
34   std::lock_guard<std::recursive_mutex> guard(m_unwind_mutex);
35   m_pcs.clear();
36   m_stop_id_is_valid = false;
37 }
38 
39 lldb::RegisterContextSP
40 HistoryUnwind::DoCreateRegisterContextForFrame(StackFrame *frame) {
41   RegisterContextSP rctx;
42   if (frame) {
43     addr_t pc = frame->GetFrameCodeAddress().GetLoadAddress(
44         &frame->GetThread()->GetProcess()->GetTarget());
45     if (pc != LLDB_INVALID_ADDRESS) {
46       rctx.reset(new RegisterContextHistory(
47           *frame->GetThread().get(), frame->GetConcreteFrameIndex(),
48           frame->GetThread()->GetProcess()->GetAddressByteSize(), pc));
49     }
50   }
51   return rctx;
52 }
53 
54 bool HistoryUnwind::DoGetFrameInfoAtIndex(uint32_t frame_idx, lldb::addr_t &cfa,
55                                           lldb::addr_t &pc) {
56   // FIXME do not throw away the lock after we acquire it..
57   std::unique_lock<std::recursive_mutex> guard(m_unwind_mutex);
58   guard.unlock();
59   if (frame_idx < m_pcs.size()) {
60     cfa = frame_idx;
61     pc = m_pcs[frame_idx];
62     return true;
63   }
64   return false;
65 }
66 
67 uint32_t HistoryUnwind::DoGetFrameCount() { return m_pcs.size(); }
68